Term
| number of species described in the world? |
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Definition
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| estimated number of species on the planet? |
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Definition
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Term
| top three animals with the most amount of species? |
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Definition
| 1. Insects 2. Arachnids 3. Mollusks |
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Term
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Definition
| 1. Flowering plants 2. Mosses 3. Ferns |
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Term
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Definition
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Term
| two reasons why biodiversity is different today compared to the past |
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Definition
| 1. extinction 2. Adaptation, speciation events |
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Term
| Extinction is an ongoing process so it's ______ but the pace of extinction is _______ |
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Definition
| 1. natural 2. accelerating |
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Term
| In the last 500 years human activity is known to have forced this number of extinctions in the wild? |
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Definition
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Term
| Of the extinction forced by human activities there are this # of animals and this # of plants? |
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Definition
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Term
| Many of the forced extinctions occurred on |
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Definition
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Term
| Extinction rates are elevated over |
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Definition
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Term
| # of bird species extinct per 100 years |
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Definition
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Term
| # of mammal species extinct per 100 years |
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Definition
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Term
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Definition
| final (with out herculean efforts and biotechnology) |
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Term
| some species are more capable of becoming |
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Definition
| extinct over others (attwater's prairie chicken but not starlings) |
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Term
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Definition
| International Union for Conservation of Nature |
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Term
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Definition
| Species threatened with extinction |
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Term
| Data for the Red List is collected about species _____ and _______ |
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Definition
| numbers and changes in numbers |
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Term
| Species being evaluated for the IUCN's red list are evaluated on |
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Definition
| the likelihood of surviving |
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Term
| The IUCN uses this to categorize each species |
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Definition
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Term
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Definition
| the minimum number of individuals of a given species that is required to maintain a healthy, viable population of the species (falls below critic. # its likely gonna be extinct) |
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Term
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Definition
| population counts or estimates are below the critical number (critically endangered, endangered, and vulnerable) |
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Term
| __% of animals threatened globally |
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Definition
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Term
| __% of global mammals threatened |
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Definition
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Term
| __% of global birds threatened |
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Definition
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Term
| __% of global amphibians threatened |
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Definition
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Term
| Why are so many species recently extinct or threatened with extinction? |
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Definition
| combo of circumstances: 1. small initial population 2. Reduction in numbers due to changes in environmental |
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Term
| Most species are rather specialized in their ________ _________ and ________ ______ |
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Definition
| feeding requirement and living conditions |
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Term
| 5 Things that change in environment that lead to extinction? |
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Definition
| 1. Physical habitat alteration 2. Exotic species 3. Overexploitation 4. Pollution 5. Climate Changes |
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Term
| 4 divisions of Physical Habitat Alteration that leads to extinction |
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Definition
| 1. Land conversion (farm replace forest) 2. Fragmentation (patches of suitable habitat unconnected) 3. Simplification (remove undesirable species and encourage desirable) 4. Intrusion (species contact) |
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Term
| Affects of Pollution when discussing extinction |
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Definition
| 1. Direct removal by poisoning 2. Indirect weakening of immune system |
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Term
| Climate changes causes problems because environmental shifts occur more rapidly then |
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Definition
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Term
| what fraction of all the worlds vertebrate species are under extinction? |
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Definition
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Term
| one in _____ mammals are under the threat of extinction |
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Definition
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Term
| one in ______ birds are under threat of extinction |
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Definition
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Term
| one in _____ reptiles are under threat of extinction |
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Definition
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Term
| since elevated biodiversity loss is linked to ______ _______ it is significant that human _______ and _____ are projected to continue for the next century or two |
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Definition
| 1. human activity 2. growth 3. affluence |
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Term
| But is biodiversity loss really a problem? (corresponds to what hallmark) |
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Definition
| 5th hallmark; sustainability involves biodiversity |
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Term
| by losing biodiversity we lose the potential of new or improved? |
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Definition
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Term
| 2 reduced ecosystem services that occur with loss of biodiversity |
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Definition
| 1. water purification 2. air replenishment |
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Term
| 3 things can be done to slow biodiversity loss? |
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Definition
| 1. active preservation of habitats 2. Promotion of policies that reduce habitat loss 3. Restrict human activities that increase exploitation |
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